Raphanus sativus (45 days) AKA Japanese Minowase Daikon Radish. Daikon is a root vegetable reported to have originated in the Mediterranean and brought to China for cultivation around 500 B.C. Roots are large, often 2 to 4 inches in diameter and 6 to 20 inches long. Very easy to grow. Approx. 2,675 seeds per ounce.